Wat Mahathat was a grand temple, likes Wat Ratchaburana. Wat Mahathat is located to the east of the grand palace. It is the royal temple and most scared in Ayutthaya during glorious time. Buddha relics were enshrined in the Mahathat Chedi(the principal pagoda).This monestery was once the residence of the Supreme Patriarch. The royal chronicle says that it was built in the reign of King Boroma-Rachathirat I in 1374 and completed in the reign of King Ramesuan.